In article , madgardener wrote:

... I think it's more alkeline (? someone set
me straight on this, as I'm not sure if it would be acidic or alkeline)... I


Alkaline, in general. Wet cement has a pH of about 12.5, though can be as
high as 14 -- the same pH as lye oven cleaner, and can cause
caustic burns on long unprotected exposure.

See:

http://www.emedicine.com/derm/topic777.htm

billo